I come from the assumption that God can read our minds. That we can pray silently and that God will hear our prayers.
However, can Satan hear our prayers as well? Can he hear our other thoughts?
I ask because if Satan can hear our thoughts, then he may learn ways to tempt us by listening to our prayers to God.
A very related question is, can he give us thoughts of evil? Whether or not he can read our minds, can he implant ideas into our minds?